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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Electron-transfer dissociation ： ウィキペディア英語版 Electron-transfer dissociation Electron-transfer dissociation (ETD) is a method of fragmenting ions in a mass spectrometer. Similar to electron-capture dissociation, ETD induces fragmentation of cations (e.g. peptides or proteins) by transferring electrons to them. It was invented by Donald F. Hunt, Joshua Coon, John E. P. Syka and Jarrod Marto at the University of Virginia. == ETD fragmentation == ETD does not use free electrons but employs radical anions (e.g. anthracene or azobenzene) for this purpose: :$(+\; nH)^\; +\; A^-\; \backslash to\; \backslash bigg^$ * + A \to fragments. where A is the anion. ETD cleaves randomly along the peptide backbone (so called c and z ions) while side chains and modifications such as phosphorylation are left intact. The technique only works well for higher charge state ions (z>2), however relative to collision-induced dissociation (CID), ETD is advantageous for the fragmentation of longer peptides or even entire proteins. This makes the technique important for top-down proteomics. Much like ECD, ETD is believed to be particularly effective for peptides with modifications such as phosphorylation. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Electron-transfer dissociation」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.